Fix memoir image prompt parsing and host allowlist

api/services/memoir_images/prompting.py

@@ -7,6 +7,7 @@ from .settings import MemoirImageSettings
 
 logger = logging.getLogger(__name__)
 _CJK_RE = re.compile(r"[\u3400-\u4dbf\u4e00-\u9fff\uf900-\ufaff]")
+_MARKDOWN_JSON_FENCE_RE = re.compile(r"^\s*```(?:json)?\s*(.*?)\s*```\s*$", re.IGNORECASE | re.DOTALL)
 
 
 class MemoirImagePromptService:
@@ -54,13 +55,15 @@ class MemoirImagePromptService:
         }
 
         if self.llm:
+            raw_response = None
             try:
                 response = self.llm.invoke(
                     "Return JSON only with keys prompt, style, size. "
                     "Convert the memoir scene into an image-generation prompt.\n"
                     + json.dumps(llm_input, ensure_ascii=False)
                 )
-                parsed = json.loads(response.content)
+                raw_response = response.content
+                parsed = json.loads(_extract_json_payload(raw_response))
                 return {
                     "prompt": _ensure_style_in_prompt(parsed["prompt"], parsed.get("style", style)),
                     "style": parsed.get("style", style),
@@ -118,6 +121,23 @@ def _contains_cjk(value: str) -> bool:
     return bool(_CJK_RE.search(value or ""))
 
 
+def _extract_json_payload(raw_response: str | None) -> str:
+    cleaned = (raw_response or "").strip()
+    fenced_match = _MARKDOWN_JSON_FENCE_RE.match(cleaned)
+    if fenced_match:
+        cleaned = fenced_match.group(1).strip()
+
+    if cleaned.startswith("{") and cleaned.endswith("}"):
+        return cleaned
+
+    start = cleaned.find("{")
+    end = cleaned.rfind("}")
+    if start != -1 and end != -1 and end > start:
+        return cleaned[start : end + 1].strip()
+
+    return cleaned
+
+
 def _ensure_style_in_prompt(prompt: str, style: str) -> str:
     cleaned_prompt = (prompt or "").strip()
     cleaned_style = (style or "").strip()